feat: add dedicated topics support for MQTT configuration

data/src/main/java/com/github/umercodez/sensorspot/data/gpsdataprovider/GpsDataProvider.kt

@@ -22,11 +22,14 @@ package com.github.umercodez.sensorspot.data.gpsdataprovider
 import kotlinx.coroutines.flow.SharedFlow
 import kotlinx.serialization.Serializable
 import kotlinx.serialization.json.Json
+import org.json.JSONObject
 
 private val jsonConf = Json {
     encodeDefaults = true
 }
 
+
+
 @Serializable
 data class GpsData(
     val type: String = "android.gps",
@@ -38,7 +41,19 @@ data class GpsData(
     val time: Long,
     val bearing: Float
 ){
-    fun toJson() =  jsonConf.encodeToString(this)
+    fun toJson(includeType: Boolean = true) :String {
+        val json = mapOf(
+            "type" to if (includeType) type else null,
+            "latitude" to latitude,
+            "longitude" to longitude,
+            "altitude" to altitude,
+            "accuracy" to accuracy,
+            "speed" to speed,
+            "time" to time,
+            "bearing" to bearing
+        ).filterValues { it != null }
+        return JSONObject(json).toString()
+    }
 }
 
 interface GpsDataProvider {

data/src/main/java/com/github/umercodez/sensorspot/data/repositories/settings/Settings.kt

@@ -1,21 +1,21 @@
-/*
- *     This file is a part of SensorSpot (https://www.github.com/UmerCodez/SensorSpot)
- *     Copyright (C) 2025 Umer Farooq (umerfarooq2383@gmail.com)
- *
- *     SensorSpot is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- *
- *     SensorSpot is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with SensorSpot. If not, see <https://www.gnu.org/licenses/>.
- *
- */
+/*
+ *     This file is a part of SensorSpot (https://www.github.com/UmerCodez/SensorSpot)
+ *     Copyright (C) 2025 Umer Farooq (umerfarooq2383@gmail.com)
+ *
+ *     SensorSpot is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     SensorSpot is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with SensorSpot. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
 package com.github.umercodez.sensorspot.data.repositories.settings
 
 
@@ -29,6 +29,7 @@ data class Settings(
     val brokerPort: Int,
     val qos: Int,
     val topic: String,
+    val dedicatedTopics: Boolean,
     val connectionTimeoutSecs: Int,
     val useCredentials: Boolean,
     val userName: String,

data/src/main/java/com/github/umercodez/sensorspot/data/repositories/settings/SettingsRepositoryImp.kt

@@ -1,21 +1,21 @@
-/*
- *     This file is a part of SensorSpot (https://www.github.com/UmerCodez/SensorSpot)
- *     Copyright (C) 2025 Umer Farooq (umerfarooq2383@gmail.com)
- *
- *     SensorSpot is free software: you can redistribute it and/or modify
- *     it under the terms of the GNU General Public License as published by
- *     the Free Software Foundation, either version 3 of the License, or
- *     (at your option) any later version.
- *
- *     SensorSpot is distributed in the hope that it will be useful,
- *     but WITHOUT ANY WARRANTY; without even the implied warranty of
- *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- *     GNU General Public License for more details.
- *
- *     You should have received a copy of the GNU General Public License
- *     along with SensorSpot. If not, see <https://www.gnu.org/licenses/>.
- *
- */
+/*
+ *     This file is a part of SensorSpot (https://www.github.com/UmerCodez/SensorSpot)
+ *     Copyright (C) 2025 Umer Farooq (umerfarooq2383@gmail.com)
+ *
+ *     SensorSpot is free software: you can redistribute it and/or modify
+ *     it under the terms of the GNU General Public License as published by
+ *     the Free Software Foundation, either version 3 of the License, or
+ *     (at your option) any later version.
+ *
+ *     SensorSpot is distributed in the hope that it will be useful,
+ *     but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ *     GNU General Public License for more details.
+ *
+ *     You should have received a copy of the GNU General Public License
+ *     along with SensorSpot. If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
 package com.github.umercodez.sensorspot.data.repositories.settings
 
 import android.content.Context
@@ -53,6 +53,7 @@ class SettingsRepositoryImp(
         val USE_CREDENTIALS = booleanPreferencesKey("use_credentials")
         val QOS = intPreferencesKey("qos")
         val TOPIC = stringPreferencesKey("topic")
+        val DEDICATED_TOPICS = booleanPreferencesKey("dedicated_topics")
         val CONNECTION_TIMEOUT_SECS = intPreferencesKey("connection_timeout_secs")
         val SENSOR_SAMPLING_RATE = intPreferencesKey("sensor_sampling_rate")
     }
@@ -69,6 +70,7 @@ class SettingsRepositoryImp(
                 useCredentials = pref[Key.USE_CREDENTIALS] ?: MqttConfigDefaults.USE_CREDENTIALS,
                 qos = pref[Key.QOS] ?: MqttConfigDefaults.QOS,
                 topic = pref[Key.TOPIC] ?: MqttConfigDefaults.TOPIC,
+                dedicatedTopics = pref[Key.DEDICATED_TOPICS] ?: MqttConfigDefaults.DEDICATED_TOPICS,
                 connectionTimeoutSecs = pref[Key.CONNECTION_TIMEOUT_SECS]
                     ?: MqttConfigDefaults.CONNECTION_TIMEOUT_SECS,
                 sensorSamplingRate = pref[Key.SENSOR_SAMPLING_RATE]
@@ -94,6 +96,7 @@ class SettingsRepositoryImp(
             pref[Key.USE_CREDENTIALS] = settings.useCredentials
             pref[Key.QOS] = settings.qos
             pref[Key.TOPIC] = settings.topic
+            pref[Key.DEDICATED_TOPICS] = settings.dedicatedTopics
             pref[Key.CONNECTION_TIMEOUT_SECS] = settings.connectionTimeoutSecs
         }
 

data/src/main/java/com/github/umercodez/sensorspot/data/sensoreventprovider/SensorEventProvider.kt

@@ -19,16 +19,22 @@
 package com.github.umercodez.sensorspot.data.sensoreventprovider
 
 import kotlinx.coroutines.flow.Flow
-import kotlinx.serialization.Serializable
-import kotlinx.serialization.json.Json
+import org.json.JSONObject
+
 
-@Serializable
 data class SensorEvent(
     val type: String,
     val values: List<Float>,
     val timestamp: Long
 ){
-    fun toJson() = Json.encodeToString(this)
+    fun toJson(includeType: Boolean = true): String {
+        val json = mapOf(
+            "type" to if (includeType) type else null,
+            "values" to values,
+            "timestamp" to timestamp
+        ).filterValues { it != null }
+        return JSONObject(json).toString()
+    }
 }
 interface SensorEventProvider {
     val events: Flow<SensorEvent>

data/src/main/java/com/github/umercodez/sensorspot/data/sensorpublisher/MqttConfig.kt

@@ -26,6 +26,7 @@ object MqttConfigDefaults{
     const val BROKER_PORT = 1883
     const val QOS = 0
     const val TOPIC = "android/sensor"
+    const val DEDICATED_TOPICS = false
     const val CONNECTION_TIMEOUT_SECS = 5
     const val USE_CREDENTIALS = false
     const val USER_NAME = ""
@@ -40,6 +41,7 @@ data class MqttConfig(
     val brokerPort: Int = MqttConfigDefaults.BROKER_PORT,
     val qos: Int = MqttConfigDefaults.QOS,
     val topic: String = MqttConfigDefaults.TOPIC,
+    val dedicatedTopics: Boolean = MqttConfigDefaults.DEDICATED_TOPICS,
     val connectionTimeoutSecs: Int = MqttConfigDefaults.CONNECTION_TIMEOUT_SECS,
     val useCredentials: Boolean = MqttConfigDefaults.USE_CREDENTIALS,
     val userName: String = MqttConfigDefaults.USER_NAME,
@@ -54,6 +56,7 @@ data class MqttConfig(
                 brokerPort = settings.brokerPort,
                 qos = settings.qos,
                 topic = settings.topic,
+                dedicatedTopics = settings.dedicatedTopics,
                 connectionTimeoutSecs = settings.connectionTimeoutSecs,
                 useCredentials = settings.useCredentials,
                 userName = settings.userName,